In the Dutch Maritime Museum in Amsterdam there are several dividers which also have a sundial insription along several astronimical sliderule inscriptions. No pictures available on the web but only Dutch descriptions. If you happen to be in Amsterdam it is a visit worth!
At 17:26 18-6-00 -0400, you wrote: -----Original Message/Oorspronkelijk bericht-------------- >This rings a bell with me. If memory serves me correctly, I recall seeing >some Renaissance mathematical instruments like sectors or folding squares >that had hour scales on them. These were scales not for laying out sundials >(dialling scales were not uncommon on these instruments), but were scales to >be used for telling time. They worked as altitude dials. When the two arms >of the instrument were opened to form a right angle, and a gnomon pin was >placed in a hole on one arm, its shadow would fall on the other arm's scale. > > >A carpenter's square, suitably inscribed, could be used in a similar >manner. > >Cheers, >Sara Schechner >39:00 N 77:01 W > > > ----------------------------------------------------------------- T. & M. Taudin-Chabot, home email: [EMAIL PROTECTED] (attachments max 500kB, in case of larger attachments contact me)
